Bicycle frame



FIG. 1 is a bottom plan view of a bicycle frame showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof, to which the right side elevation view is a mirror image;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a rear perspective view thereof; and,

FIG. 7 is a front perspective view thereof. 

CLAIM The ornamental design for a bicycle frame, as shown and described. 